Fix cloning typed arrays

[scagood]

This attempts to fix Typed Array cloning.

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I had to add a node version check in the tests because:

1. TypedArray.from was added in node 4

Image of failed test runs in actions summary

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I have pre-run all the tests already here:

Name	Link
Tests: node.js >= 10	https://github.com/scagood/js-traverse/actions/runs/5943582826
Tests: node.js < 10	https://github.com/scagood/js-traverse/actions/runs/5943582822
Tests: pretest/posttest	https://github.com/scagood/js-traverse/actions/runs/5943582818

[ljharb]

I've rebased this, and pulled some of the smaller changes into main.

[ljharb]

This seems good; I’ve got a bunch of TODOs to replace inline code with deps, so I’m thinking about the best release plan for that before merging this.

[ljharb]

@scagood turns out Uint8Array.from isn't always available, so I changed it to new Uint8Array; then tests revealed that copying a Typed Array would be easier using typedarray.prototype.slice; now they're failing in another place because BYTES_PER_ELEMENT is readonly.

Please fetch my latest changes and work off of those; I'll mark this PR as a draft until the tests are passing again.

[ljharb]

Thanks!